You can also get as deep into the details of networking as you like; see in particular the CFNetwork Programming Guide. Apple provides a generous amount of. Here, we’ll review some basic CFNetwork and socket programming concepts to help guide to low-level programming, Beej’s Guide to Network Programming. Conference Companion on Object Oriented Programming Systems Languages andApplications (OOPSLA ’09) (pp. to CFNetwork programming guide.
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When a stream-related event occurs, your callback function specified by the registration call is called. Your First Android Application Chapter 2. In this listing, the kCFAllocatorDefault parameter specifies that the current default system allocator be used to allocate memory for the stream and the fileURL parameter specifies the name of the file for which this read stream is being created, such as programning It provides run-loop integration, so if your application is run loop based you can use network protocols without implementing threads.
To learn more about run loops in general, read Threading Programming Guide. Opening a stream causes the stream to reserve any system resources that it requires, such as the file descriptor needed to open the file. Bill Phillips, Chris Stewart Length: Documentation Archive Developer Search. A stream is a sequence of bytes transmitted serially over a communications path.
If you set the retain and release parameters to NULLthen the system will expect you to keep the memory pointed to by the info pointer alive until the stream itself is destroyed. Please try submitting your feedback later. A stream property is any information about the stream, such as its source or destination, that is not part of the actual data being read or written. Your input helps improve our developer documentation. The process of acquiring information about a host is known as resolution.
So if you set it to your function cvnetworkas in the code above, CFStream will call myRetain myPtr to retain the info pointer. Start programming robots NOW! To poll a stream, you first check to see if the streams are ready for reading or writing, then perform a read or write operation on the stream.
These APIs can be used in combination, or separately, depending on your application. Robots Start programming robots NOW! The client context also allows you the option of setting the retainreleaseand copyDescription parameters to NULL.
How helpful is this document? If you understand the networking protocols and need the low-level control they provide but programming want to implement them yourself, then CFNetwork is probably the right choice.
This process is repeated as many times as is necessary. Implicit Intents Chapter In addition to the documentation provided by Apple, the following is the reference book for socket-level programming:. Styles and Themes Chapter Following serialization, a request might look like this:. You can use read and write streams in much the same way as you do UNIX file descriptors. When you no longer need the stream, close and dispose of it.
First, take the dynamic store reference and set it up to monitor for any changes to the proxies. See Listing for an example.
CFNetwork Programming Guide
Both block until at least one byte can be read, and both continue reading as long as they can do so without blocking. Documentation Archive Developer Search. How helpful is this document? With deserialization, a raw byte stream received from a client or server is restored to its native representation. How helpful is this document? Read and write streams provide an easy way to exchange data to and from a variety of media in a device-independent way.
With the exception of the process of creating those streams, they behave similarly. Similarly, the release parameter, myReleaseis a pointer to a function to release the info parameter. You can create streams for data located in memory, in a file, or on a network using socketsand you can use streams without loading all of the data into memory at once.
CFNetwork Programming Guide – – ITeye博客
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